package com.surfilter.util;

import com.surfilter.config.StartConfig;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Ping {

    public static boolean ping(String ipAddress, int pingTimes, int timeOut) {
        BufferedReader in = null;
        Runtime r = Runtime.getRuntime();  // 将要执行的ping命令,此命令是windows格式的命令
        String pingCommand = "ping " + ipAddress + " -n " + pingTimes + " -w " + timeOut;
        if (StartConfig.isOSLinux()) {
            pingCommand = "ping " + ipAddress + " -c " + pingTimes + " -w " + timeOut;
        }
        try {   // 执行命令并获取输出
            System.out.println( pingCommand );
            Process p = r.exec( pingCommand );
            if (p == null) {
                return false;
            }
            in = new BufferedReader( new InputStreamReader( p.getInputStream() ) );   // 逐行检查输出,计算类似出现=23ms TTL=62字样的次数
            int connectedCount = 0;
            String line = null;
            while ((line = in.readLine()) != null) {
                connectedCount += getCheckResult( line );
            }   // 如果出现类似=23ms TTL=62这样的字样,出现的次数=测试次数则返回真
            return connectedCount == pingTimes;
        } catch (Exception ex) {
            ex.printStackTrace();   // 出现异常则返回假
            return false;
        } finally {
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    //若line含有=18ms TTL=16字样,说明已经ping通,返回1,否則返回0.
    private static int getCheckResult(String line) {  // System.out.println("控制台输出的结果为:"+line);
        Pattern pattern = Pattern.compile( "(\\d+ms)(\\s+)(TTL=\\d+)", Pattern.CASE_INSENSITIVE );
        Matcher matcher = pattern.matcher( line );
        while (matcher.find()) {
            return 1;
        }
        return 0;
    }

    public static void main(String[] args) throws Exception {
        String ipAddress = "www.cnblogs.com";
        long start = System.currentTimeMillis();
        System.out.println( ping( ipAddress, 1, 1000 ) );
        System.out.println( System.currentTimeMillis() - start );
/*        ping02(ipAddress);
        System.out.println(ping(ipAddress, 5, 5000));*/
    }
}